1) An erected penis
2) Corpse which is cold and become stiff
3) Nickname for someone called Christopher
1) Every morning I've got a massive stiffer
2) Got to perform an autopsie on a stiffer
3) Hey Stiffer what you up to tonight
Slang. A person who fails to tip (stiffs) an employee that is normally tipped, such as bar and restaraunt wait-staff, pizza delivery drivers, hairstylists/barbers, taxi drivers, etc.
A good tipper gets their pizzas MUCH faster than the stiffer does.
Stiffers who don't tip their bartender often find themselves very thirsty.